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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: VaadinSessionContainer.html 883 2014-05-07 02:45:34Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.vaadin7;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.vaadin.server.SessionDestroyEvent;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.vaadin.server.SessionDestroyListener;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import com.vaadin.server.SessionInitEvent;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import com.vaadin.server.SessionInitListener;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import com.vaadin.server.VaadinService;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import com.vaadin.server.VaadinSession;<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.ArrayList;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import java.util.Collection;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.slf4j.Logger;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.slf4j.LoggerFactory;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>/**<a name="line.23"></a>
<span class="sourceLineNo">024</span> * Container containing active {@link VaadinSession}s.<a name="line.24"></a>
<span class="sourceLineNo">025</span> *<a name="line.25"></a>
<span class="sourceLineNo">026</span> * &lt;p&gt;<a name="line.26"></a>
<span class="sourceLineNo">027</span> * This class is useful when you need to display sessions in your GUI, for example, a table showing all logged-in users.<a name="line.27"></a>
<span class="sourceLineNo">028</span> * Due to the fact that each {@link VaadinSession} has its own lock, building such a container without race conditions<a name="line.28"></a>
<span class="sourceLineNo">029</span> * and deadlocks is somewhat tricky. This class performs the locking required during updates and provides thread-safe<a name="line.29"></a>
<span class="sourceLineNo">030</span> * {@link #update} and {@link #reload} methods. Information about active {@link VaadinSession}s comes from the session<a name="line.30"></a>
<span class="sourceLineNo">031</span> * tracking feature of the {@link SpringVaadinServlet}.<a name="line.31"></a>
<span class="sourceLineNo">032</span> *<a name="line.32"></a>
<span class="sourceLineNo">033</span> * &lt;p&gt;<a name="line.33"></a>
<span class="sourceLineNo">034</span> * By subclassing this class and {@link VaadinSessionInfo}, additional session-related properties,<a name="line.34"></a>
<span class="sourceLineNo">035</span> * such as logged-in user, can be added to the container by annotating the {@link VaadinSessionInfo}<a name="line.35"></a>
<span class="sourceLineNo">036</span> * subclass with {@link ProvidesProperty &amp;#64;ProvidesProperty} annotations.<a name="line.36"></a>
<span class="sourceLineNo">037</span> * &lt;/p&gt;<a name="line.37"></a>
<span class="sourceLineNo">038</span> *<a name="line.38"></a>
<span class="sourceLineNo">039</span> * &lt;p&gt;<a name="line.39"></a>
<span class="sourceLineNo">040</span> * Note the following:<a name="line.40"></a>
<span class="sourceLineNo">041</span> * &lt;ul&gt;<a name="line.41"></a>
<span class="sourceLineNo">042</span> *  &lt;li&gt;This class only works with configurations where Vaadin sessions are stored in memory,<a name="line.42"></a>
<span class="sourceLineNo">043</span> *      and the {@link SpringVaadinServlet} must be used and configured with init parameter<a name="line.43"></a>
<span class="sourceLineNo">044</span> *      {@link SpringVaadinServlet#SESSION_TRACKING_PARAMETER} set to {@code true}.&lt;/li&gt;<a name="line.44"></a>
<span class="sourceLineNo">045</span> *  &lt;li&gt;The {@link #connect} and {@link #disconnect} methods must be invoked before and after (respectively)<a name="line.45"></a>
<span class="sourceLineNo">046</span> *      this container is used; typically these would be invoked in the {@link com.vaadin.ui.Component#attach}<a name="line.46"></a>
<span class="sourceLineNo">047</span> *      and {@link com.vaadin.ui.Component#detach} methods of a corresponding widget.<a name="line.47"></a>
<span class="sourceLineNo">048</span> * &lt;/ul&gt;<a name="line.48"></a>
<span class="sourceLineNo">049</span> * &lt;/p&gt;<a name="line.49"></a>
<span class="sourceLineNo">050</span> *<a name="line.50"></a>
<span class="sourceLineNo">051</span> * @param &lt;T&gt; the type of the Java objects that back each {@link com.vaadin.data.Item} in the container<a name="line.51"></a>
<span class="sourceLineNo">052</span> */<a name="line.52"></a>
<span class="sourceLineNo">053</span>@SuppressWarnings("serial")<a name="line.53"></a>
<span class="sourceLineNo">054</span>public abstract class VaadinSessionContainer&lt;T extends VaadinSessionInfo&gt; extends SelfKeyedContainer&lt;T&gt; {<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * The {@link VaadinSession} that this container instance is associated with.<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * Determined by whatever {@link VaadinSession} is associated with the current thread at construction time.<a name="line.58"></a>
<span class="sourceLineNo">059</span>     */<a name="line.59"></a>
<span class="sourceLineNo">060</span>    protected final VaadinSession session;<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>    private final Logger log = LoggerFactory.getLogger(this.getClass());<a name="line.62"></a>
<span class="sourceLineNo">063</span>    private final SessionEventListener listener = new SessionEventListener();<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    /**<a name="line.65"></a>
<span class="sourceLineNo">066</span>     * Constructor.<a name="line.66"></a>
<span class="sourceLineNo">067</span>     *<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * &lt;p&gt;<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * Properties will be determined by the {@link ProvidesProperty &amp;#64;ProvidesProperty} and<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * {@link ProvidesPropertySort &amp;#64;ProvidesPropertySort} annotated methods in the given class.<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * &lt;/p&gt;<a name="line.71"></a>
<span class="sourceLineNo">072</span>     *<a name="line.72"></a>
<span class="sourceLineNo">073</span>     * @param type class to introspect for annotated methods<a name="line.73"></a>
<span class="sourceLineNo">074</span>     * @throws IllegalArgumentException if {@code type} is null<a name="line.74"></a>
<span class="sourceLineNo">075</span>     * @throws IllegalArgumentException if {@code type} has two {@link ProvidesProperty &amp;#64;ProvidesProperty}<a name="line.75"></a>
<span class="sourceLineNo">076</span>     *  or {@link ProvidesPropertySort &amp;#64;ProvidesPropertySort} annotated methods for the same property<a name="line.76"></a>
<span class="sourceLineNo">077</span>     * @throws IllegalArgumentException if a {@link ProvidesProperty &amp;#64;ProvidesProperty}-annotated method with no<a name="line.77"></a>
<span class="sourceLineNo">078</span>     *  {@linkplain ProvidesProperty#value property name specified} has a name which cannot be interpreted as a bean<a name="line.78"></a>
<span class="sourceLineNo">079</span>     *  property "getter" method<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * @throws IllegalStateException if there is no {@link VaadinSession} associated with the current thread<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * @throws IllegalStateException if there is no {@link SpringVaadinServlet} associated<a name="line.81"></a>
<span class="sourceLineNo">082</span>     *  with the current thread's {@link VaadinSession}<a name="line.82"></a>
<span class="sourceLineNo">083</span>     * @see ProvidesProperty<a name="line.83"></a>
<span class="sourceLineNo">084</span>     * @see ProvidesPropertySort<a name="line.84"></a>
<span class="sourceLineNo">085</span>     * @see ProvidesPropertyScanner<a name="line.85"></a>
<span class="sourceLineNo">086</span>     */<a name="line.86"></a>
<span class="sourceLineNo">087</span>    protected VaadinSessionContainer(Class&lt;T&gt; type) {<a name="line.87"></a>
<span class="sourceLineNo">088</span>        super(type);<a name="line.88"></a>
<span class="sourceLineNo">089</span>        this.session = VaadinUtil.getCurrentSession();<a name="line.89"></a>
<span class="sourceLineNo">090</span>        SpringVaadinServlet.getServlet(this.session);<a name="line.90"></a>
<span class="sourceLineNo">091</span>    }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>    /**<a name="line.93"></a>
<span class="sourceLineNo">094</span>     * Constructor.<a name="line.94"></a>
<span class="sourceLineNo">095</span>     *<a name="line.95"></a>
<span class="sourceLineNo">096</span>     * @param propertyExtractor used to extract properties from the underlying Java objects;<a name="line.96"></a>
<span class="sourceLineNo">097</span>     *  may be null but then container is not usable until one is configured via<a name="line.97"></a>
<span class="sourceLineNo">098</span>     * {@link #setPropertyExtractor setPropertyExtractor()}<a name="line.98"></a>
<span class="sourceLineNo">099</span>     * @param propertyDefs container property definitions; null is treated like the empty set<a name="line.99"></a>
<span class="sourceLineNo">100</span>     */<a name="line.100"></a>
<span class="sourceLineNo">101</span>    protected VaadinSessionContainer(PropertyExtractor&lt;? super T&gt; propertyExtractor,<a name="line.101"></a>
<span class="sourceLineNo">102</span>      Collection&lt;? extends PropertyDef&lt;?&gt;&gt; propertyDefs) {<a name="line.102"></a>
<span class="sourceLineNo">103</span>        super(propertyExtractor, propertyDefs);<a name="line.103"></a>
<span class="sourceLineNo">104</span>        this.session = VaadinUtil.getCurrentSession();<a name="line.104"></a>
<span class="sourceLineNo">105</span>        SpringVaadinServlet.getServlet(this.session);<a name="line.105"></a>
<span class="sourceLineNo">106</span>    }<a name="line.106"></a>
<span class="sourceLineNo">107</span><a name="line.107"></a>
<span class="sourceLineNo">108</span>    /**<a name="line.108"></a>
<span class="sourceLineNo">109</span>     * Connect this container and start tracking sessions.<a name="line.109"></a>
<span class="sourceLineNo">110</span>     */<a name="line.110"></a>
<span class="sourceLineNo">111</span>    @Override<a name="line.111"></a>
<span class="sourceLineNo">112</span>    public void connect() {<a name="line.112"></a>
<span class="sourceLineNo">113</span>        super.connect();<a name="line.113"></a>
<span class="sourceLineNo">114</span>        this.listener.register();<a name="line.114"></a>
<span class="sourceLineNo">115</span>        this.reload();<a name="line.115"></a>
<span class="sourceLineNo">116</span>    }<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span>    /**<a name="line.118"></a>
<span class="sourceLineNo">119</span>     * Disconnect this container and stop tracking sessions.<a name="line.119"></a>
<span class="sourceLineNo">120</span>     */<a name="line.120"></a>
<span class="sourceLineNo">121</span>    @Override<a name="line.121"></a>
<span class="sourceLineNo">122</span>    public void disconnect() {<a name="line.122"></a>
<span class="sourceLineNo">123</span>        this.listener.unregister();<a name="line.123"></a>
<span class="sourceLineNo">124</span>        super.disconnect();<a name="line.124"></a>
<span class="sourceLineNo">125</span>    }<a name="line.125"></a>
<span class="sourceLineNo">126</span><a name="line.126"></a>
<span class="sourceLineNo">127</span>    /**<a name="line.127"></a>
<span class="sourceLineNo">128</span>     * Asynchronously reload this container.<a name="line.128"></a>
<span class="sourceLineNo">129</span>     *<a name="line.129"></a>
<span class="sourceLineNo">130</span>     * &lt;p&gt;<a name="line.130"></a>
<span class="sourceLineNo">131</span>     * This method can be invoked from any thread. It creates a new thread to do the actual<a name="line.131"></a>
<span class="sourceLineNo">132</span>     * reloading via {@link #doReload} to avoid potential deadlocks.<a name="line.132"></a>
<span class="sourceLineNo">133</span>     * &lt;/p&gt;<a name="line.133"></a>
<span class="sourceLineNo">134</span>     */<a name="line.134"></a>
<span class="sourceLineNo">135</span>    public void reload() {<a name="line.135"></a>
<span class="sourceLineNo">136</span>        new Thread("VaadinSessionContainer.reload()") {<a name="line.136"></a>
<span class="sourceLineNo">137</span>            @Override<a name="line.137"></a>
<span class="sourceLineNo">138</span>            public void run() {<a name="line.138"></a>
<span class="sourceLineNo">139</span>                try {<a name="line.139"></a>
<span class="sourceLineNo">140</span>                    VaadinSessionContainer.this.doReload();<a name="line.140"></a>
<span class="sourceLineNo">141</span>                } catch (ThreadDeath t) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>                    throw t;<a name="line.142"></a>
<span class="sourceLineNo">143</span>                } catch (Throwable t) {<a name="line.143"></a>
<span class="sourceLineNo">144</span>                    VaadinSessionContainer.this.log.error("error reloading container " + this, t);<a name="line.144"></a>
<span class="sourceLineNo">145</span>                }<a name="line.145"></a>
<span class="sourceLineNo">146</span>            }<a name="line.146"></a>
<span class="sourceLineNo">147</span>        }.start();<a name="line.147"></a>
<span class="sourceLineNo">148</span>    }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span>    /**<a name="line.150"></a>
<span class="sourceLineNo">151</span>     * Asynchronously update this container's items.<a name="line.151"></a>
<span class="sourceLineNo">152</span>     *<a name="line.152"></a>
<span class="sourceLineNo">153</span>     * &lt;p&gt;<a name="line.153"></a>
<span class="sourceLineNo">154</span>     * This method can be invoked from any thread. It creates a new thread to do the actual<a name="line.154"></a>
<span class="sourceLineNo">155</span>     * updating via {@link #doUpdate} to avoid potential deadlocks.<a name="line.155"></a>
<span class="sourceLineNo">156</span>     * &lt;/p&gt;<a name="line.156"></a>
<span class="sourceLineNo">157</span>     */<a name="line.157"></a>
<span class="sourceLineNo">158</span>    public void update() {<a name="line.158"></a>
<span class="sourceLineNo">159</span>        new Thread("VaadinSessionContainer.update()") {<a name="line.159"></a>
<span class="sourceLineNo">160</span>            @Override<a name="line.160"></a>
<span class="sourceLineNo">161</span>            public void run() {<a name="line.161"></a>
<span class="sourceLineNo">162</span>                try {<a name="line.162"></a>
<span class="sourceLineNo">163</span>                    VaadinSessionContainer.this.doUpdate();<a name="line.163"></a>
<span class="sourceLineNo">164</span>                } catch (ThreadDeath t) {<a name="line.164"></a>
<span class="sourceLineNo">165</span>                    throw t;<a name="line.165"></a>
<span class="sourceLineNo">166</span>                } catch (Throwable t) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>                    VaadinSessionContainer.this.log.error("error updating container " + this, t);<a name="line.167"></a>
<span class="sourceLineNo">168</span>                }<a name="line.168"></a>
<span class="sourceLineNo">169</span>            }<a name="line.169"></a>
<span class="sourceLineNo">170</span>        }.start();<a name="line.170"></a>
<span class="sourceLineNo">171</span>    }<a name="line.171"></a>
<span class="sourceLineNo">172</span><a name="line.172"></a>
<span class="sourceLineNo">173</span>    /**<a name="line.173"></a>
<span class="sourceLineNo">174</span>     * Update each {@link VaadinSessionInfo} instance in this container.<a name="line.174"></a>
<span class="sourceLineNo">175</span>     * Using this method is more efficient than reloading the entire container.<a name="line.175"></a>
<span class="sourceLineNo">176</span>     *<a name="line.176"></a>
<span class="sourceLineNo">177</span>     * &lt;p&gt;<a name="line.177"></a>
<span class="sourceLineNo">178</span>     * This method handles the complicated locking required to avoid deadlocks: first, for each {@link VaadinSessionInfo},<a name="line.178"></a>
<span class="sourceLineNo">179</span>     * {@link VaadinSessionInfo#updateInformation} is invoked while the {@link VaadinSession}<a name="line.179"></a>
<span class="sourceLineNo">180</span>     * corresponding to &lt;i&gt;that {@link VaadinSessionInfo} instance&lt;/i&gt; is locked, so that information from that session<a name="line.180"></a>
<span class="sourceLineNo">181</span>     * can be safely gathered; then, {@link VaadinSessionInfo#makeUpdatesVisible} is invoked while the {@link VaadinSession}<a name="line.181"></a>
<span class="sourceLineNo">182</span>     * associated with &lt;i&gt;this container&lt;/i&gt; is locked, so item properties can be safely updated, etc.<a name="line.182"></a>
<span class="sourceLineNo">183</span>     * &lt;/p&gt;<a name="line.183"></a>
<span class="sourceLineNo">184</span>     *<a name="line.184"></a>
<span class="sourceLineNo">185</span>     * &lt;p&gt;<a name="line.185"></a>
<span class="sourceLineNo">186</span>     * This method must &lt;b&gt;not&lt;/b&gt; be invoked while any {@link VaadinSession} is locked.<a name="line.186"></a>
<span class="sourceLineNo">187</span>     * For example, it may be invoked by a regular timer (only while this container is {@linkplain #connect connected}).<a name="line.187"></a>
<span class="sourceLineNo">188</span>     * &lt;/p&gt;<a name="line.188"></a>
<span class="sourceLineNo">189</span>     *<a name="line.189"></a>
<span class="sourceLineNo">190</span>     * @throws IllegalStateException if there is a locked {@link VaadinSession} associated with the current thread<a name="line.190"></a>
<span class="sourceLineNo">191</span>     */<a name="line.191"></a>
<span class="sourceLineNo">192</span>    protected void doUpdate() {<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>        // Sanity check<a name="line.194"></a>
<span class="sourceLineNo">195</span>        if (VaadinSession.getCurrent() != null &amp;&amp; VaadinSession.getCurrent().hasLock())<a name="line.195"></a>
<span class="sourceLineNo">196</span>            throw new IllegalStateException("inside locked VaadinSession");<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span>        // Snapshot the set of sessions in this container while holding the lock to this container's session<a name="line.198"></a>
<span class="sourceLineNo">199</span>        final ArrayList&lt;T&gt; sessionInfoList = new ArrayList&lt;&gt;();<a name="line.199"></a>
<span class="sourceLineNo">200</span>        VaadinSessionContainer.this.session.accessSynchronously(new Runnable() {<a name="line.200"></a>
<span class="sourceLineNo">201</span>            @Override<a name="line.201"></a>
<span class="sourceLineNo">202</span>            public void run() {<a name="line.202"></a>
<span class="sourceLineNo">203</span>                sessionInfoList.addAll(VaadinSessionContainer.this.getItemIds());<a name="line.203"></a>
<span class="sourceLineNo">204</span>            }<a name="line.204"></a>
<span class="sourceLineNo">205</span>        });<a name="line.205"></a>
<span class="sourceLineNo">206</span><a name="line.206"></a>
<span class="sourceLineNo">207</span>        // Update each session's information while holding that session's lock<a name="line.207"></a>
<span class="sourceLineNo">208</span>        for (T sessionInfo : sessionInfoList) {<a name="line.208"></a>
<span class="sourceLineNo">209</span>            final T sessionInfo2 = sessionInfo;<a name="line.209"></a>
<span class="sourceLineNo">210</span>            sessionInfo.getVaadinSession().accessSynchronously(new Runnable() {<a name="line.210"></a>
<span class="sourceLineNo">211</span>                @Override<a name="line.211"></a>
<span class="sourceLineNo">212</span>                public void run() {<a name="line.212"></a>
<span class="sourceLineNo">213</span>                    sessionInfo2.updateInformation();<a name="line.213"></a>
<span class="sourceLineNo">214</span>                }<a name="line.214"></a>
<span class="sourceLineNo">215</span>            });<a name="line.215"></a>
<span class="sourceLineNo">216</span>        }<a name="line.216"></a>
<span class="sourceLineNo">217</span><a name="line.217"></a>
<span class="sourceLineNo">218</span>        // Now update this container with the newly gathered information while again holding the lock to this container's session<a name="line.218"></a>
<span class="sourceLineNo">219</span>        VaadinSessionContainer.this.session.accessSynchronously(new Runnable() {<a name="line.219"></a>
<span class="sourceLineNo">220</span>            @Override<a name="line.220"></a>
<span class="sourceLineNo">221</span>            public void run() {<a name="line.221"></a>
<span class="sourceLineNo">222</span>                for (T sessionInfo : sessionInfoList)<a name="line.222"></a>
<span class="sourceLineNo">223</span>                    sessionInfo.makeUpdatesVisible();<a name="line.223"></a>
<span class="sourceLineNo">224</span>            }<a name="line.224"></a>
<span class="sourceLineNo">225</span>        });<a name="line.225"></a>
<span class="sourceLineNo">226</span>    }<a name="line.226"></a>
<span class="sourceLineNo">227</span><a name="line.227"></a>
<span class="sourceLineNo">228</span>    /**<a name="line.228"></a>
<span class="sourceLineNo">229</span>     * Reload this container. Reloads this container with {@link VaadinSessionInfo} instances for each {@link VaadinSession}<a name="line.229"></a>
<span class="sourceLineNo">230</span>     * (created via {@link #createVaadinSessionInfo}), and then invokes {@link #doUpdate}.<a name="line.230"></a>
<span class="sourceLineNo">231</span>     *<a name="line.231"></a>
<span class="sourceLineNo">232</span>     * &lt;p&gt;<a name="line.232"></a>
<span class="sourceLineNo">233</span>     * This method must &lt;b&gt;not&lt;/b&gt; be invoked while any {@link VaadinSession} is locked.<a name="line.233"></a>
<span class="sourceLineNo">234</span>     * &lt;/p&gt;<a name="line.234"></a>
<span class="sourceLineNo">235</span>     *<a name="line.235"></a>
<span class="sourceLineNo">236</span>     * @throws IllegalStateException if there is a locked {@link VaadinSession} associated with the current thread<a name="line.236"></a>
<span class="sourceLineNo">237</span>     */<a name="line.237"></a>
<span class="sourceLineNo">238</span>    protected void doReload() {<a name="line.238"></a>
<span class="sourceLineNo">239</span><a name="line.239"></a>
<span class="sourceLineNo">240</span>        // Sanity check<a name="line.240"></a>
<span class="sourceLineNo">241</span>        if (VaadinSession.getCurrent() != null &amp;&amp; VaadinSession.getCurrent().hasLock())<a name="line.241"></a>
<span class="sourceLineNo">242</span>            throw new IllegalStateException("inside locked VaadinSession");<a name="line.242"></a>
<span class="sourceLineNo">243</span><a name="line.243"></a>
<span class="sourceLineNo">244</span>        // Create a VaadinSessionInfo object for each session, but doing so while that session is locked<a name="line.244"></a>
<span class="sourceLineNo">245</span>        final ArrayList&lt;T&gt; sessionInfoList = new ArrayList&lt;&gt;();<a name="line.245"></a>
<span class="sourceLineNo">246</span>        for (VaadinSession otherSession : SpringVaadinServlet.getServlet(this.session).getSessions()) {<a name="line.246"></a>
<span class="sourceLineNo">247</span>            otherSession.accessSynchronously(new Runnable() {<a name="line.247"></a>
<span class="sourceLineNo">248</span>                @Override<a name="line.248"></a>
<span class="sourceLineNo">249</span>                public void run() {<a name="line.249"></a>
<span class="sourceLineNo">250</span>                    sessionInfoList.add(VaadinSessionContainer.this.createVaadinSessionInfo());<a name="line.250"></a>
<span class="sourceLineNo">251</span>                }<a name="line.251"></a>
<span class="sourceLineNo">252</span>            });<a name="line.252"></a>
<span class="sourceLineNo">253</span>        }<a name="line.253"></a>
<span class="sourceLineNo">254</span><a name="line.254"></a>
<span class="sourceLineNo">255</span>        // Reload this container<a name="line.255"></a>
<span class="sourceLineNo">256</span>        this.session.access(new Runnable() {<a name="line.256"></a>
<span class="sourceLineNo">257</span>            @Override<a name="line.257"></a>
<span class="sourceLineNo">258</span>            public void run() {<a name="line.258"></a>
<span class="sourceLineNo">259</span>                VaadinSessionContainer.this.load(sessionInfoList);<a name="line.259"></a>
<span class="sourceLineNo">260</span>            }<a name="line.260"></a>
<span class="sourceLineNo">261</span>        });<a name="line.261"></a>
<span class="sourceLineNo">262</span><a name="line.262"></a>
<span class="sourceLineNo">263</span>        // Update this container<a name="line.263"></a>
<span class="sourceLineNo">264</span>        this.doUpdate();<a name="line.264"></a>
<span class="sourceLineNo">265</span>    }<a name="line.265"></a>
<span class="sourceLineNo">266</span><a name="line.266"></a>
<span class="sourceLineNo">267</span>    /**<a name="line.267"></a>
<span class="sourceLineNo">268</span>     * Create a {@link VaadinSessionInfo} backing object for the {@link VaadinSession} associated with the current thread.<a name="line.268"></a>
<span class="sourceLineNo">269</span>     * The {@link VaadinSession} will be already locked.<a name="line.269"></a>
<span class="sourceLineNo">270</span>     */<a name="line.270"></a>
<span class="sourceLineNo">271</span>    protected abstract T createVaadinSessionInfo();<a name="line.271"></a>
<span class="sourceLineNo">272</span><a name="line.272"></a>
<span class="sourceLineNo">273</span>// SessionEventListener<a name="line.273"></a>
<span class="sourceLineNo">274</span><a name="line.274"></a>
<span class="sourceLineNo">275</span>    private class SessionEventListener extends VaadinExternalListener&lt;VaadinService&gt;<a name="line.275"></a>
<span class="sourceLineNo">276</span>      implements SessionInitListener, SessionDestroyListener {<a name="line.276"></a>
<span class="sourceLineNo">277</span><a name="line.277"></a>
<span class="sourceLineNo">278</span>        public SessionEventListener() {<a name="line.278"></a>
<span class="sourceLineNo">279</span>            super(VaadinUtil.getCurrentSession().getService());<a name="line.279"></a>
<span class="sourceLineNo">280</span>        }<a name="line.280"></a>
<span class="sourceLineNo">281</span><a name="line.281"></a>
<span class="sourceLineNo">282</span>        @Override<a name="line.282"></a>
<span class="sourceLineNo">283</span>        public void sessionInit(SessionInitEvent event) {<a name="line.283"></a>
<span class="sourceLineNo">284</span>            VaadinSessionContainer.this.reload();<a name="line.284"></a>
<span class="sourceLineNo">285</span>        }<a name="line.285"></a>
<span class="sourceLineNo">286</span><a name="line.286"></a>
<span class="sourceLineNo">287</span>        @Override<a name="line.287"></a>
<span class="sourceLineNo">288</span>        public void sessionDestroy(SessionDestroyEvent event) {<a name="line.288"></a>
<span class="sourceLineNo">289</span>            VaadinSessionContainer.this.reload();<a name="line.289"></a>
<span class="sourceLineNo">290</span>        }<a name="line.290"></a>
<span class="sourceLineNo">291</span><a name="line.291"></a>
<span class="sourceLineNo">292</span>        @Override<a name="line.292"></a>
<span class="sourceLineNo">293</span>        protected void register(VaadinService vaadinService) {<a name="line.293"></a>
<span class="sourceLineNo">294</span>            vaadinService.addSessionInitListener(this);<a name="line.294"></a>
<span class="sourceLineNo">295</span>            vaadinService.addSessionDestroyListener(this);<a name="line.295"></a>
<span class="sourceLineNo">296</span>        }<a name="line.296"></a>
<span class="sourceLineNo">297</span><a name="line.297"></a>
<span class="sourceLineNo">298</span>        @Override<a name="line.298"></a>
<span class="sourceLineNo">299</span>        protected void unregister(VaadinService vaadinService) {<a name="line.299"></a>
<span class="sourceLineNo">300</span>            vaadinService.removeSessionInitListener(this);<a name="line.300"></a>
<span class="sourceLineNo">301</span>            vaadinService.removeSessionDestroyListener(this);<a name="line.301"></a>
<span class="sourceLineNo">302</span>        }<a name="line.302"></a>
<span class="sourceLineNo">303</span>    }<a name="line.303"></a>
<span class="sourceLineNo">304</span>}<a name="line.304"></a>
<span class="sourceLineNo">305</span><a name="line.305"></a>




























































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